If sourcing Plaques by way of Maniac's Prayers from the Rat Market, the only real associated action cost is upconverting. In big batches, this produces 105 Plaques per action. For the most efficient cycle above (illuminated road, 180 scrip per 14.2 actions) this adds .4 actions per cycle, for a total of 14.6 actions. This cuts the SPA down very slightly to 12.32. It affects the other less efficient options similarly. Pretty negligible, and it's still a great SPA.